Synthese und Charakterisierung eines neuen gemischten Titan-Aluminium-Alkoxids

The novel Ti-Al-Alkoxide TiAl2(OiPr)10 was synthesized from aluminium turnings and titanium tetraiso-propoxide in 2-propanol and isolated by subsequent fractionating distillation. Colourless prismatic crystals precipitated after 24 h at 20 deg C from the main fraction. They proved very moisture sensitive. The compound crystallizes in the monoclinic space group C2/c (no. 15) with a = 2303.1(4), b = 1097.2(3), c = 1685.0(3) pm, sigma = 104.32(1)deg and Z = 4. The molecular structure exhibits a bent Al-Ti-Al' unit, in which AI shows tetrahedral, but Ti octahedral coordination. The polyhedra are connected via cis-edges of the octahedron. The structure of the compound in solution was determined by NMR spectroscopy (1H, 13C, COSY) and proved to be identical to the structure in the solid state.